{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,29]],"date-time":"2025-12-29T13:22:46Z","timestamp":1767014566421,"version":"3.48.0"},"reference-count":51,"publisher":"Springer Science and Business Media LLC","issue":"6","license":[{"start":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T00:00:00Z","timestamp":1762473600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T00:00:00Z","timestamp":1762473600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Combinatorica"],"published-print":{"date-parts":[[2025,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    A family of\n                    <jats:italic>r<\/jats:italic>\n                    distinct sets\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\{A_1,\\ldots , A_r\\}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mo>{<\/mml:mo>\n                            <mml:msub>\n                              <mml:mi>A<\/mml:mi>\n                              <mml:mn>1<\/mml:mn>\n                            <\/mml:msub>\n                            <mml:mo>,<\/mml:mo>\n                            <mml:mo>\u2026<\/mml:mo>\n                            <mml:mo>,<\/mml:mo>\n                            <mml:msub>\n                              <mml:mi>A<\/mml:mi>\n                              <mml:mi>r<\/mml:mi>\n                            <\/mml:msub>\n                            <mml:mo>}<\/mml:mo>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    is an\n                    <jats:italic>r<\/jats:italic>\n                    -sunflower if for all\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$1 \\leqslant i &lt; j\\leqslant r$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mn>1<\/mml:mn>\n                            <mml:mo>\u2a7d<\/mml:mo>\n                            <mml:mi>i<\/mml:mi>\n                            <mml:mo>&lt;<\/mml:mo>\n                            <mml:mi>j<\/mml:mi>\n                            <mml:mo>\u2a7d<\/mml:mo>\n                            <mml:mi>r<\/mml:mi>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    and\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$1 \\leqslant i' &lt; j'\\leqslant r$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mn>1<\/mml:mn>\n                            <mml:mo>\u2a7d<\/mml:mo>\n                            <mml:msup>\n                              <mml:mi>i<\/mml:mi>\n                              <mml:mo>\u2032<\/mml:mo>\n                            <\/mml:msup>\n                            <mml:mo>&lt;<\/mml:mo>\n                            <mml:msup>\n                              <mml:mi>j<\/mml:mi>\n                              <mml:mo>\u2032<\/mml:mo>\n                            <\/mml:msup>\n                            <mml:mo>\u2a7d<\/mml:mo>\n                            <mml:mi>r<\/mml:mi>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    , we have\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$A_i\\cap A_j = A_{i'}\\cap A_{j'}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:msub>\n                              <mml:mi>A<\/mml:mi>\n                              <mml:mi>i<\/mml:mi>\n                            <\/mml:msub>\n                            <mml:mo>\u2229<\/mml:mo>\n                            <mml:msub>\n                              <mml:mi>A<\/mml:mi>\n                              <mml:mi>j<\/mml:mi>\n                            <\/mml:msub>\n                            <mml:mo>=<\/mml:mo>\n                            <mml:msub>\n                              <mml:mi>A<\/mml:mi>\n                              <mml:msup>\n                                <mml:mi>i<\/mml:mi>\n                                <mml:mo>\u2032<\/mml:mo>\n                              <\/mml:msup>\n                            <\/mml:msub>\n                            <mml:mo>\u2229<\/mml:mo>\n                            <mml:msub>\n                              <mml:mi>A<\/mml:mi>\n                              <mml:msup>\n                                <mml:mi>j<\/mml:mi>\n                                <mml:mo>\u2032<\/mml:mo>\n                              <\/mml:msup>\n                            <\/mml:msub>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    . Erd\u0151s and Rado conjectured in 1960 that every family\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\mathcal {H}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mi>H<\/mml:mi>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    of\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\ell $$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mi>\u2113<\/mml:mi>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    -element sets of size at least\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$K(r)^\\ell $$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>K<\/mml:mi>\n                            <mml:msup>\n                              <mml:mrow>\n                                <mml:mo>(<\/mml:mo>\n                                <mml:mi>r<\/mml:mi>\n                                <mml:mo>)<\/mml:mo>\n                              <\/mml:mrow>\n                              <mml:mi>\u2113<\/mml:mi>\n                            <\/mml:msup>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    contains an\n                    <jats:italic>r<\/jats:italic>\n                    -sunflower, where\n                    <jats:italic>K<\/jats:italic>\n                    (\n                    <jats:italic>r<\/jats:italic>\n                    ) is some function that depends only on\n                    <jats:italic>r<\/jats:italic>\n                    . We prove that if\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\mathcal {H}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mi>H<\/mml:mi>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    is a family of\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\ell $$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mi>\u2113<\/mml:mi>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    -element sets of VC-dimension at most\n                    <jats:italic>d<\/jats:italic>\n                    and\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$|\\mathcal H| &gt; (C r(\\log d+\\log ^*\\ell ))^\\ell $$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mrow>\n                              <mml:mo>|<\/mml:mo>\n                              <mml:mi>H<\/mml:mi>\n                              <mml:mo>|<\/mml:mo>\n                              <mml:mo>&gt;<\/mml:mo>\n                            <\/mml:mrow>\n                            <mml:msup>\n                              <mml:mrow>\n                                <mml:mo>(<\/mml:mo>\n                                <mml:mi>C<\/mml:mi>\n                                <mml:mi>r<\/mml:mi>\n                                <mml:mrow>\n                                  <mml:mo>(<\/mml:mo>\n                                  <mml:mo>log<\/mml:mo>\n                                  <mml:mi>d<\/mml:mi>\n                                  <mml:mo>+<\/mml:mo>\n                                  <mml:msup>\n                                    <mml:mo>log<\/mml:mo>\n                                    <mml:mo>\u2217<\/mml:mo>\n                                  <\/mml:msup>\n                                  <mml:mi>\u2113<\/mml:mi>\n                                  <mml:mo>)<\/mml:mo>\n                                <\/mml:mrow>\n                                <mml:mo>)<\/mml:mo>\n                              <\/mml:mrow>\n                              <mml:mi>\u2113<\/mml:mi>\n                            <\/mml:msup>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    for some absolute constant\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$C &gt; 0$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>C<\/mml:mi>\n                            <mml:mo>&gt;<\/mml:mo>\n                            <mml:mn>0<\/mml:mn>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    , then\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\mathcal {H}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mi>H<\/mml:mi>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    contains an\n                    <jats:italic>r<\/jats:italic>\n                    -sunflower. This improves a recent result of Fox, Pach, and Suk. When\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$d=1$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>d<\/mml:mi>\n                            <mml:mo>=<\/mml:mo>\n                            <mml:mn>1<\/mml:mn>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    , we obtain a sharp bound, namely that\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$|\\mathcal H| &gt; (r-1)^\\ell $$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msup>\n                            <mml:mrow>\n                              <mml:mo>|<\/mml:mo>\n                              <mml:mi>H<\/mml:mi>\n                              <mml:mo>|<\/mml:mo>\n                              <mml:mo>&gt;<\/mml:mo>\n                              <mml:mrow>\n                                <mml:mo>(<\/mml:mo>\n                                <mml:mi>r<\/mml:mi>\n                                <mml:mo>-<\/mml:mo>\n                                <mml:mn>1<\/mml:mn>\n                                <mml:mo>)<\/mml:mo>\n                              <\/mml:mrow>\n                            <\/mml:mrow>\n                            <mml:mi>\u2113<\/mml:mi>\n                          <\/mml:msup>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    is sufficient. Along the way, we establish a strengthening of the Kahn\u2013Kalai conjecture for set families of bounded VC-dimension, which is of independent interest.\n                  <\/jats:p>","DOI":"10.1007\/s00493-025-00186-8","type":"journal-article","created":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T11:26:29Z","timestamp":1762514789000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sunflowers in Set Systems with Small VC-Dimension"],"prefix":"10.1007","volume":"45","author":[{"given":"J\u00f3zsef","family":"Balogh","sequence":"first","affiliation":[]},{"given":"Anton","family":"Bernshteyn","sequence":"additional","affiliation":[]},{"given":"Michelle","family":"Delcourt","sequence":"additional","affiliation":[]},{"given":"Asaf","family":"Ferber","sequence":"additional","affiliation":[]},{"given":"Huy Tuan","family":"Pham","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2025,11,7]]},"reference":[{"key":"186_CR1","unstructured":"Allen, P., B\u00f6ttcher, J., Kohayakawa, Y., Neve, M.: Robustness of the Sauer\u2013Spencer Theorem. arXiv:2507.03676 (preprint). 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